Structural transitions in ultra-thin nickel films on Rh{111}

Wander, A.; Barnes, Colin; Mapledoram, L.D.; King, David A.

doi:10.1016/0039-6028(93)90853-c

Cited by 24 publications

(15 citation statements)

References 19 publications

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“…This result is also corroborated by the LEED image of 2 ML Ni on Rh(111) in Fig. 1d, which shows hexagons of satellite spots surrounding the main LEED reflexes, in agreement with previous results [23]. The separation between the main and satellite diffraction spots (see inset in Fig.…”

Section: Resultssupporting

confidence: 79%

Surface structure of nickel oxide layers on a Rh(111) surface

et al. 2013

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The formation of nickel oxide nanolayers by oxidizing Ni overlayers on Rh(111) has been investigated and their structures are reported as a function of the nickel coverage and oxygen pressure. Scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) and diffraction (XPD), and high-resolution electron energy loss spectroscopy (HREELS) have been applied to characterize the structure and stoichiometry of the nickel oxide nanolayers. Several different phases have been observed depending on the strain state of the metallic Ni overlayers. For the pseudomorphic Ni monolayer, two distinctly different oxide phases with (6 ×1)-Ni 5 O 5 and (2√3×2)-Ni 8 O 10 structures have been identified at oxygen-poor (p=5×10 −8 mbar) and oxygen-rich (p≥1×10 −6 mbar) conditions, respectively. Above one monolayer, where the Ni layers are relaxed, bulk-like NiO(100) films form at the O-rich conditions, whereas chemisorbed-type p(2 ×2)O\Ni(111) layers develop in the O-poor regime. X-ray photoelectron diffraction analysis has provided additional insight into the relaxation mechanism and the detailed atomic structure of the Ni-oxide nanolayers.

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Section: Resultssupporting

confidence: 79%

Surface structure of nickel oxide layers on a Rh(111) surface

et al. 2013

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“…Then, the Ni film was removed by prolonged Ar þ sputtering and annealing at 1075 K. The cleanliness of the surface was checked with Auger electron spectroscopy (AES) and showed no elements on the surface other than Rh. At all coverages, LEED data exhibited a sharp hexagonal pattern indicating a 1 Â 1 registry between the film and the substrate, in agreement with previous studies [14]. The lattice parameter for the relaxed Ni(111) is a Ni ¼ 2:49 # A, giving a mismatch strain of 7.4%.…”

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confidence: 90%

Room-Temperature Self-Assembly of Equilateral Triangular Clusters via Friedel Oscillations

et al. 2008

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We report on the formation of equilateral triangular clusters hollow inside with 5-6 atoms per side, selfassembled on Ni adislands grown on Rh(111). The observation of standing wave patterns on the Ni adislands and the Rh(111) indicates that the self-assembly is mediated by Friedel oscillations. In this context, we propose a model based on the energy of interaction between adsorbates, which explains the formation of the clusters as a result of the assembly of rows of 5-6 adatoms.

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“…The LEED electronic state generated by the islands can be constructed as a linear combination of amplitudes resulting from overlayer atoms being placed further and further away from their equilibrium position, with unknown coefficients to be fit to the data. This should enable the extraction of information about properties such as the maximum island size [52]., Thirdly, a more tentative possibility exists. Methods such as direct inversion of electron holography rely on the linearity of the underlying mathematical schemes.…”

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confidence: 99%